Bulb outage warning system
First Claim
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1. A receiving circuit for producing an output in response to a signal pulse train imposed on a voltage supply line comprising:
- a. means for detecting the presence of pulses on said supply line,b. indicating means,c. control means responsive to said pulses for initiating operation of said indicating means, andd. digital filter means for discriminating between no pulses, random pulses, and said train of pulses for inhibiting said control means when no pulses or random pulses are detected.
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Abstract
A warning system for detecting a burned out or defective bulb for a motor vehicle is disclosed. A transmitting circuit is connected to detect current flow through the bulb to be monitored. Failure of the bulb to draw current causes the transmitting circuit to produce a series of small voltage pulses on the battery line. These pulses are detected by a receiving circuit which causes an outage indicator light to be illuminated.
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5 Claims
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1. A receiving circuit for producing an output in response to a signal pulse train imposed on a voltage supply line comprising:
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a. means for detecting the presence of pulses on said supply line, b. indicating means, c. control means responsive to said pulses for initiating operation of said indicating means, and d. digital filter means for discriminating between no pulses, random pulses, and said train of pulses for inhibiting said control means when no pulses or random pulses are detected. - View Dependent Claims (2, 3, 4, 5)
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Specification